Some shops use a Smoke Gun to find vacuum leaks.
The actually inject smoke into the intake manifold.
Seen it used a couple of times & found it pretty slick.

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2007 C 230 Sport.

http://www.bmwcsregistry.org/Technical/vacuum_leak.html

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"

Good stuff Mike,,, will try the ether thing tomorrow, but what if the leak in in the passenger compartment somewhere. There are tons of vaccum lines under the dash.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K

That is very interesting also. If I get some smoke inside the car I guess I'll know where to look.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K

Peter:

I may stand corrected, but the vacuum system(s) you would be spraying under the hood are isolated from the vacuum lines inside the vehicle in so much that you would not draw starting fluid inside the vehicle.

Perhaps a pro tech will chime in and confirm this.

__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"